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What Every
                          Programmer Should
                             Know About
                          Distributed Systems

Friday, November 11, 11
What Every
                    Programmer Could
                  Possibly Want To Know
                         About Me

Friday, November 11, 11
Friday, November 11, 11
Friday, November 11, 11
Friday, November 11, 11
Friday, November 11, 11
What Every
                          Programmer Should
                             Know About
                          Distributed Systems

Friday, November 11, 11
I
                          Definition




Friday, November 11, 11
A distributed system
               consists of multiple
               autonomous applications
               that interact with each other to
               achieve a common goal.


Friday, November 11, 11
II
                          Code Granularity




                                             Photo by Matt Gibson

Friday, November 11, 11
print "Converting Celsius or Fahrenheit? "
                          option = gets[0,1].downcase
                          case option
                          when "c"
                            print "Convert C: "
                            celsius = gets.to_i
                            fahrenheit = celsius * 9/5 + 32
                            puts "#{celsius}C = #{fahrenheit}F"
                          when "f"
                            print "Convert F: "
                            fahrenheit = gets.to_i
                            celsius = (fahrenheit - 32) * 5/9
                            puts "#{fahrenheit}F = #{celsius}C"
                          end




Friday, November 11, 11
def main
                            convert(pick_unit)
                          end

                          def pick_unit
                            print "Convert Celsius ou Fahrenheit? "
                            gets[0,1].downcase
                          end

                          def convert(unit)
                            case unit
                                when "c": convert_celsius
                                when "f": convert_fahrenheit
                            end
                          end


                          ...


Friday, November 11, 11
Ideal Granularity


                             Somewhere in between




Friday, November 11, 11
Units & OO

                    • Methods
                    • Classes
                    • Packages


Friday, November 11, 11
Units & Languages

                    •     Ruby        # sinatra.rb
                                      module Sinatra
                    • Java              class Application
                                          ...

                    • PHP               class Event
                                          ...
                                        module Streaming
                                          class FileStreamer
                                            ...




Friday, November 11, 11
Units & Languages

                    • Ruby
                    • Java
                    • PHP $ javac Sinatra.java
                          sinatra.java:5: class Application is public, should be
                          declared in a file named Application.java




Friday, November 11, 11
Units & Languages

                    • Ruby
                    • Java
                    • PHP


Friday, November 11, 11
Units & Architecture


                    • Applications



Friday, November 11, 11
III
                          The Evolution of Óbidos




                                                    From Google Maps

Friday, November 11, 11
Friday, November 11, 11
Heroku

                    • Instance management
                    • Billing & invoices
                    • Process orchestration
                    • Public API

Friday, November 11, 11
Heroku

                    • Instance management

                    • Billing & invoices
                    • Process orchestration
                    • Public API

Friday, November 11, 11
Heroku
                    • Instance management

                    • Billing & invoices

                    • Process orchestration
                    • Public API
Friday, November 11, 11
Heroku
                    • Instance management

                    • Billing & invoices

                    • Process orchestration

                    • Public API
Friday, November 11, 11
IV
                          Developing the Medium




Friday, November 11, 11
Problem:

                             ?




Friday, November 11, 11
Share the Database




Friday, November 11, 11
OT
 O NShare the Database
D




Friday, November 11, 11
REST



     RestClient.get "host/users/1"    get "/users/:id" do |id|
                                        user = User.find(id)
                                        user.to_json
                                      end




Friday, November 11, 11
MQ




  AMQP.start(:host => "1.2.3.4") do           AMQP.start(:host => "1.2.3.4") do
    q = MQ.new.queue("user.created")            q = MQ.new.queue("user.created")
    q.publish(:email => "pedro@heroku.com")     q.subscribe do |msg|
  end                                             ...
                                                end
                                              end


Friday, November 11, 11
V
                          Challenges




Friday, November 11, 11
Challenges
                    • Versioning
                    • Testing
                    • Authentication
                    • Development environment
                    • Visual consistency
                    • Deploying
Friday, November 11, 11
Summary
                    1. Definition
                    2. Code Granularity
                    3. The Evolution of Óbidos
                    4. Developing the Medium
                    5. Challenges



Friday, November 11, 11
Thank you!
                           pedro@heroku.com


                          http://pedro.heroku.com


                                  @ped



Friday, November 11, 11

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What Every Programmer Should Know About Distributed Systems

  • 1. What Every Programmer Should Know About Distributed Systems Friday, November 11, 11
  • 2. What Every Programmer Could Possibly Want To Know About Me Friday, November 11, 11
  • 7. What Every Programmer Should Know About Distributed Systems Friday, November 11, 11
  • 8. I Definition Friday, November 11, 11
  • 9. A distributed system consists of multiple autonomous applications that interact with each other to achieve a common goal. Friday, November 11, 11
  • 10. II Code Granularity Photo by Matt Gibson Friday, November 11, 11
  • 11. print "Converting Celsius or Fahrenheit? " option = gets[0,1].downcase case option when "c" print "Convert C: " celsius = gets.to_i fahrenheit = celsius * 9/5 + 32 puts "#{celsius}C = #{fahrenheit}F" when "f" print "Convert F: " fahrenheit = gets.to_i celsius = (fahrenheit - 32) * 5/9 puts "#{fahrenheit}F = #{celsius}C" end Friday, November 11, 11
  • 12. def main convert(pick_unit) end def pick_unit print "Convert Celsius ou Fahrenheit? " gets[0,1].downcase end def convert(unit) case unit when "c": convert_celsius when "f": convert_fahrenheit end end ... Friday, November 11, 11
  • 13. Ideal Granularity Somewhere in between Friday, November 11, 11
  • 14. Units & OO • Methods • Classes • Packages Friday, November 11, 11
  • 15. Units & Languages • Ruby # sinatra.rb module Sinatra • Java class Application ... • PHP class Event ... module Streaming class FileStreamer ... Friday, November 11, 11
  • 16. Units & Languages • Ruby • Java • PHP $ javac Sinatra.java sinatra.java:5: class Application is public, should be declared in a file named Application.java Friday, November 11, 11
  • 17. Units & Languages • Ruby • Java • PHP Friday, November 11, 11
  • 18. Units & Architecture • Applications Friday, November 11, 11
  • 19. III The Evolution of Óbidos From Google Maps Friday, November 11, 11
  • 21. Heroku • Instance management • Billing & invoices • Process orchestration • Public API Friday, November 11, 11
  • 22. Heroku • Instance management • Billing & invoices • Process orchestration • Public API Friday, November 11, 11
  • 23. Heroku • Instance management • Billing & invoices • Process orchestration • Public API Friday, November 11, 11
  • 24. Heroku • Instance management • Billing & invoices • Process orchestration • Public API Friday, November 11, 11
  • 25. IV Developing the Medium Friday, November 11, 11
  • 26. Problem: ? Friday, November 11, 11
  • 27. Share the Database Friday, November 11, 11
  • 28. OT O NShare the Database D Friday, November 11, 11
  • 29. REST RestClient.get "host/users/1" get "/users/:id" do |id| user = User.find(id) user.to_json end Friday, November 11, 11
  • 30. MQ AMQP.start(:host => "1.2.3.4") do AMQP.start(:host => "1.2.3.4") do q = MQ.new.queue("user.created") q = MQ.new.queue("user.created") q.publish(:email => "pedro@heroku.com") q.subscribe do |msg| end ... end end Friday, November 11, 11
  • 31. V Challenges Friday, November 11, 11
  • 32. Challenges • Versioning • Testing • Authentication • Development environment • Visual consistency • Deploying Friday, November 11, 11
  • 33. Summary 1. Definition 2. Code Granularity 3. The Evolution of Óbidos 4. Developing the Medium 5. Challenges Friday, November 11, 11
  • 34. Thank you! pedro@heroku.com http://pedro.heroku.com @ped Friday, November 11, 11